Help me build a PC ($1000)

This is probably the best general value you could get at that price point when you include the cost of Windows:

https://www.microcenter.com/site/content/custom-pc-builder.aspx?load=55dd8369-fe5e-4040-bf18-dd02d27a7fa0

Comes out to $1006.91 before taxes. Considering that you're video editing and doing music production, I would not go any lower on the processor and RAM, but if you need to lower the price a bit when including taxes you do have a little wiggle room when it comes to the motherboard and video card. You could jump down to something like an ASRock B450 Pro4 for $89.99 and then jump down to something like a GTX 1650 Super which is between $160-200. You could also change your storage around a bit if you don't need a lot space. Use a smaller SSD for Windows for example or ditch the hard drive for just a single 1TB SSD. 

As for monitors, there's a lot of options, depending on what kind of price range you have. If you play a lot of FPS/competitive type games (think Fortnite, Call of Duty, Overwatch, League of Legends, fighting games), you'll want something 144Hz with 1MS response time, like these:

https://www.microcenter.com/product/610481/msi-optix-mag241mvc-236-full-hd-144hz-hdmi-dp-freesync--curved-led-gaming-monitor

https://www.microcenter.com/product/609307/asus-vg248qz-24-full-hd-144hz-1ms-dp-hdmi-dvi-esports-widescreen-led-gaming-monitor

https://www.microcenter.com/product/612848/acer-nitro-vg240y-pbiip-238-full-hd-144hz-hdmi-dp-freesync-ips-led-monitor

That Acer has the benefit of also having an IPS panel which can be beneficial for video editing since it should have better color representation/accuracy.